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船用低速柴油机曲轴的载荷除柴油机工作过程的作用力外,还有通过机座传递的船体变形载荷。已经建立一个计算模型,用它来计算这类曲轴在所有边界条件下的弯曲应力。为了确保计算,用理想的空间有限元作为曲轴计算的当量模型。为了减少计算费用,曲臂与曲柄销之间过渡圆角的弯曲应力可用已经确定的可靠的系数来计算。此外、还可以求得曲轴的变形,特别是曲臂间距差。主轴承计算采用了文献中常用的估算法,估算法不仅适用于弯曲应力的计算,而且在计算模型中的应用也容易修正。
The load of the marine low-speed diesel engine crankshaft, in addition to the working force of the diesel engine, also has the deformation load of the hull which is transmitted through the base. A computational model has been established for calculating the bending stresses of such crankshafts under all boundary conditions. In order to ensure the calculation, the ideal space finite element is used as the equivalent model for crankshaft calculation. In order to reduce the calculation cost, the bending stress of the fillet between the crank arm and the crankpin can be calculated with the reliable coefficient that has been determined. In addition, crankshaft deformation can also be obtained, in particular, the difference between the crank arm. The main bearing calculation uses the common estimation method in the literature. The estimation method is not only suitable for the calculation of bending stress, but also easy to correct in the calculation model.